LT1 LOW FUEL PRESSURE

[DC Smith]

Somene else mentioned it, but you need to check the polarity of the
wiring on the pump. It is a DC motor and will run backwards if wired
improperly. Just thought I'd toss it out again, since it seems to have
been overlooked. I have wired a fuel pump backwards myself, so I know
it's possible. :)

Luke Joseph wrote:
> 
> I did just that last night but for only a few seconds.  In the few seconds
> that the pump was on upon turning the ignition key it did not even pump
> enough fuel to get to my gas can.  Only a couple ounces was in my hose.
> >From what you are saying the In a few seconds I should have a solid flow of
> fuel that would give me about a cup or so of fuel.  I think I will pull my
> sending unit tonight and look at things the list has suggested.  By the way
> I am using 3/8's as the supply and I have heard that the 5/16 is restricted
> to 1/4 somewhere, so it is alright to use 1/4 as return.    Thanks,
> 
> Luke
> 
> > -----Original Message-----
> > From: John_Calabrese at ENGELHARD.COM [SMTP:John_Calabrese at ENGELHARD.COM]
> > Sent: Tuesday, October 19, 1999 3:03 PM
> > To:   gmecm at efi332.eng.ohio-state.edu
> > Subject:      RE: LT1 LOW FUEL PRESSURE
> >
> >
> >
> > Luke,
> > Disconnect the inlet fuel line from the injection rails, cycle the pump.
> > If
> > fuel flows out, run the pump for 30 seconds, or until you fill a gallon
> > jug with
> > gas.  That is you gph flow of the pump. It should take more than 45 sec to
> > 1
> > minute to fill the gallon jug.  If it doesn't, bye bye pump or there is a
> > restriction in the line or sock.  If it does flow enough at that point,
> > then you
> > need to make sure the regualator isn't bad, if you cut off the return line
> > (dead
> > end fuel flow) and the pressure doesn't come up, bye bye pump.  If the
> > fuel flow
> > is low and the pressure comes up when dead ended, there is probably a
> > restriction in the lines.  Are you checking the fuel pressure using the
> > schrader
> > valve on the rail?
> >

-- 
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Dan Smith      84 Regal   11.841 at 115.09     GSCA# 1459
St.Charles, Missouri 
mailto:morepoweral at tetranet.net               
http://www.tetranet.net/users/morepoweral
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